WEBVTT POLICE SAY THEY DID NOT HAVE AN IMPORTANT PIECE OF INFORMATION. THAT IS RIGHT. MANY LAWMAKERS ARE WORRIED ABOUT IT. THEY FAILED GOVERNMENT AGENCIES DROPPED THE BALL WHEN HE CAME TO SHARING INFORMATION THAT COULD HAVE PREVENTED THIS. MY FEAR IS THEY MAY HAVE SUCCEEDED BECAUSE THE SYSTEM FAILED. WE CAN AND WE MUST DO BETTER. THAT WAS THE SENTIMENT TODAY AS THE HOUSE COMMITTEE ON HOMELAND SECURITY HELD A HEARING ON THE BOSTON MARATHON ATTACKS. LAWMAKERS WANT TO KNOW WHY THE GOVERNMENT DID NOT SHARE INFORMATION ABOUT THE SUSPECTS, TAMERLAN DZHOKHAR -- AND DZHOKHAR TSARNAEV. THEY WERE WARNED TWO YEARS AGO THAT TAMERLAN HAD BECOME A FOLLOWER OF RADICAL ISLAM. A RED FLAG THAT NEVER MADE IT TO THE BOSTON POLICE COMMISSIONER EDWARD DAVIS. IN HINDSIGHT, CERTAINLY. CRACKS HE IS RECOMMENDING TIGHTER SECURITY AROUND LARGE PUBLIC EVENT. JOE LIEBERMAN SAID THE GOVERNMENT NEEDS TO DO MORE TO COUNTER VIOLENT ISLAMIC EXTREMISM. CRACKS I BELIEVE THAT IT WAS POSSIBLE TO HAVE PREVENTED THE TERRORIST ATTACKS IN BOSTON. EVEN WITH FOUR PEOPLE DEAD, COMMISSIONER DAVIS INSISTS THEY DID NOT ACCOMPLISH THE GOAL. THE CITY IS BACK ON THEIR FEET. HE HAD NO EFFECT ON THE CITY OF BOSTON EXCEPT TO MAKE A STRONGER. HE IS CALLING FOR MORE SURVEILLANCE CAMERAS AND OTHER TECHNOLOGY AROUND BOSTON TO HELP